Samwontech TEMP2000 Series Installation Manual page 42

SAMWONTECH
4.2.1.3 Over-Integral Prevention
▶ It is one of efficient method to control when disturbance occurs.
☞ This function suppresses overshoot due to over-integral when control output reaches to max value.
▶ It does not work when I=0 at PID set value.
☞ When there is no Over-Integral Prevention(ARW) function
Target SP
Starting
Disturbance
NPV starts decreasing by external shcok
Then, it makes MV increase and reach to
the peak point 100% output generating
▶ It takes time to dissolve the accumulated integral term even Disturbance is released, and
cause big Overshoot, and take time for NPV to be stable.
☞ When there is Over-Integral Prevention(ARW) function
Target SP
Starting
Disturbance
NPV starts decreasing by external shcok
Then, it makes MV increase and reach to
the peak point 100% output generating
▶ Reverse calculate the integral term until NPV enters ±P BAND, and reduce the integral term
dissolve time after disturbance released.
quickly.
2nd Edition of TEMP2000_Series IM : July. 16. 2010
▲ ▲
Clearing
Disturbance
In spite of clearing disturbance,
MV should be lasting 100% by
acumulative integral term
▲ ▲
Clearing
Disturbance acumulated integral term
In spite of clearing disturbance,
MV should be lasting 100% by
acumulative integral term
Control Output (MV)
▲
Breaking up
acumulated integral term
Control Output (MV)
Current PV (NPV)
Inverse calculation by ARW
▲
Breaking up
It reduces Overshoot, and NPV is stabilized
Current PV (NPV)
MV starts decreasing from
dissolving acumulatied
integral term.
P BAND
MV starts decreasing from
dissolving acumulatied
integral term.
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